Information Notice 2001-10, Failure of Central Sprinkler Company'S Model Gb Series Fire Sprinkler Heads: Difference between revisions

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| issue date = 06/28/2001
| issue date = 06/28/2001
| title = Failure of Central Sprinkler Company'S Model Gb Series Fire Sprinkler Heads
| title = Failure of Central Sprinkler Company'S Model Gb Series Fire Sprinkler Heads
| author name = Leach M N, Marsh L B
| author name = Leach M, Marsh L
| author affiliation = NRC/NMSS/FCSS/FCLB, NRC/NRR/DRIP
| author affiliation = NRC/NMSS/FCSS/FCLB, NRC/NRR/DRIP
| addressee name =  
| addressee name =  
Line 14: Line 14:
| page count = 7
| page count = 7
}}
}}
{{#Wiki_filter:UNITED STATESNUCLEAR REGULATORY COMMISSIONOFFICE OF NUCLEAR REACTOR REGULATIONWashington, D.C. 20555-0001June 28, 2001NRC INFORMATION NOTICE 2001-10:FAILURE OF CENTRAL SPRINKLER COMPANYMODEL GB SERIES FIRE SPRINKLER HEADS
{{#Wiki_filter:UNITED STATES
 
NUCLEAR REGULATORY COMMISSION
 
OFFICE OF NUCLEAR REACTOR REGULATION
 
Washington, D.C. 20555-0001 June 28, 2001 NRC INFORMATION NOTICE 2001-10: FAILURE OF CENTRAL SPRINKLER COMPANY
 
MODEL GB SERIES FIRE SPRINKLER HEADS


==Addressees==
==Addressees==
Line 20: Line 28:


==Purpose==
==Purpose==
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice to warnaddressees that certain Model GB series sprinkler heads manufactured by Central Sprinkler
The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice to warn


Co. of Lansdale, Pennsylvania, have a potential for failure. It is expected that recipients will
addressees that certain Model GB series sprinkler heads manufactured by Central Sprinkler
 
Co. of Lansdale, Pennsylvania, have a potential for failure. It is expected that recipients will


review the information for applicability and consider actions, as appropriate, to ensure safety at
review the information for applicability and consider actions, as appropriate, to ensure safety at


their facilities. However, suggestions contained in this information notice are not NRC
their facilities. However, suggestions contained in this information notice are not NRC


requirements; therefore, no specific action or written response is required.
requirements; therefore, no specific action or written response is required.


==Description of Circumstances==
==Description of Circumstances==
On April 24, 2001, Underwriters Laboratories Inc. (UL) issued a news release on the failures of field samples of certain Model GB series sprinkler heads during operational testing. UL
On April 24, 2001, Underwriters Laboratories Inc. (UL) issued a news release on the failures
 
of field samples of certain Model GB series sprinkler heads during operational testing. UL


tested over 1800 GB series heads from over 100 different locations and found that 26 percent
tested over 1800 GB series heads from over 100 different locations and found that 26 percent
Line 37: Line 49:
of the sprinkler heads needed higher water pressure than the 5 psi required for UL listing.
of the sprinkler heads needed higher water pressure than the 5 psi required for UL listing.


Seven percent needed over 40 psi to operate and some did not operate at 60 psi. This is of
Seven percent needed over 40 psi to operate and some did not operate at 60 psi. This is of


great concern because the sprinkler systems are relied upon to protect structures, systems, or
great concern because the sprinkler systems are relied upon to protect structures, systems, or


components important to safety against fire.The sprinkler heads have O-ring water seals and were introduced in 1988.  The followingmodels are  of concern: GB, GB-ALPHA, GB-J, GB-QR, GB-EC, GB-RS, GB-20, GB-20QR,
components important to safety against fire.
GBR, GB-R1, GB-R2, GBR-LF, GB4, GB4-EC, GB4-FR, GB4-QREC, BB1, BB2, BB3, SD1, SD2, SD3, HIP, ROC, LF, and WS.  Because of design changes, some of these models may


have "O-ring" water seals and some may have disc spring water seals. Only the sprinkler head
The sprinkler heads have O-ring water seals and were introduced in 1988. The following


models with the "O" ring seal are of concern, not the models with the disc spring water seals.
models are of concern: GB, GB-ALPHA, GB-J, GB-QR, GB-EC, GB-RS, GB-20, GB-20QR,
GBR, GB-R1, GB-R2, GBR-LF, GB4, GB4-EC, GB4-FR, GB4-QREC, BB1, BB2, BB3, SD1, SD2, SD3, HIP, ROC, LF, and WS. Because of design changes, some of these models may


UL's Web site at: www.ul.com/about/newsrel/nr042401.html has pictures and descriptions ofthe water seals of different models.Licensees who have GB series sprinkler heads installed in their facility may consider havingsome of the heads tested.  UL will test heads submitted at no additional cost beyond the
have O-ring water seals and some may have disc spring water seals. Only the sprinkler head


expense of removal, packaging, handling, and postage. Instructions for selecting, removing, and packaging the heads can be obtained from Central Sprinkling Co. at 1-800-523-6512. Related Generic Communications!IN 99-28, "Recall of Star Brand Fire Protection Sprinkler Heads," September 30, 1999!IN 97-72, "Potential for Failure of the Omega Series Sprinkler Heads," September 22,1997This information notice requires no specific action or written response. If you have anyquestions about the information in this notice, please contact one of the technical contacts
models with the O ring seal are of concern, not the models with the disc spring water seals.
 
ULs Web site at: www.ul.com/about/newsrel/nr042401.html has pictures and descriptions of
 
the water seals of different models.
 
Licensees who have GB series sprinkler heads installed in their facility may consider having
 
some of the heads tested. UL will test heads submitted at no additional cost beyond the
 
expense of removal, packaging, handling, and postage. Instructions for selecting, removing, and packaging the heads can be obtained from Central Sprinkling Co. at 1-800-523-6512.
 
Related Generic Communications
 
!       IN 99-28, Recall of Star Brand Fire Protection Sprinkler Heads, September 30, 1999
!       IN 97-72, Potential for Failure of the Omega Series Sprinkler Heads, September 22,
        1997 This information notice requires no specific action or written response. If you have any
 
questions about the information in this notice, please contact one of the technical contacts


listed below or the appropriate Office of Nuclear Reactor Regulation (NRR) or Office of Nuclear
listed below or the appropriate Office of Nuclear Reactor Regulation (NRR) or Office of Nuclear


Material and Safeguards (NMSS) project manager./RA/J. Tappert for/RA/L. Roche forLedyard B. Marsh, ChiefMelvyn N. Leach, Acting ChiefEvents Assessment, Generic CommunicationsFuel Cycle Licensing Branch
Material and Safeguards (NMSS) project manager.
 
/RA/J. Tappert for                                           /RA/L. Roche for
 
Ledyard B. Marsh, Chief                                      Melvyn N. Leach, Acting Chief
 
Events Assessment, Generic Communications                    Fuel Cycle Licensing Branch
 
and Non-Power Reactors Branch                              Division of Fuel Cycle Safety
 
Division of Regulatory Improvement Programs                    and Safeguards


and Non-Power Reactors BranchDivision of Fuel Cycle Safety
Office of Nuclear Reactor Regulation                          Office of Nuclear Material Safety


Division of Regulatory Improvement Programs  and Safeguards
and Safeguards


Office of Nuclear Reactor RegulationOffice of Nuclear Material Safety  and SafeguardsTechnical Contacts:Paul LainPeter LeeNRR/DSSA/SPLBNMSS/FCSS/FCLB
Technical Contacts:   Paul Lain                              Peter Lee


(301) 415-2346(301) 415-8111 E-Mail: pwl@nrc.govE-mail: psl1@nrc.govAttachments:1.List of Recently Issued NRC Information Notices
NRR/DSSA/SPLB                          NMSS/FCSS/FCLB


2.List of Recently Issued NMSS Information Notices Related Generic Communication!IN 99-28, "Recall of Star Brand Fire Protection Sprinkler Heads," September 30, 1999!IN 97-72, "Potential for Failure of the Omega Series Sprinkler Heads," September 22, 1997This information notice requires no specific action or written response. If you have anyquestions about the information in this notice, please contact one of the technical contacts
(301) 415-2346                        (301) 415-8111 E-Mail: pwl@nrc.gov                    E-mail: psl1@nrc.gov


listed below or the appropriate Office of Nuclear Reactor Regulation (NRR) or Office of Nuclear
Attachments:
1. List of Recently Issued NRC Information Notices


Material and Safeguards (NMSS) project manager./RA/J. Tappert for  /RA/L. Roche forLedyard B. Marsh, ChiefMelvyn N. Leach, Acting ChiefEvents Assessment, Generic CommunicationsFuel Cycle Licensing Branch
2. List of Recently Issued NMSS Information Notices


and Non-Power Reactors BranchDivision of Fuel Cycle Safety
ML011790352 OFFICE    REXB:          Tech Editor      DSSA:              NMSS              NMSS        NMSS


Division of Regulatory Improvement Programs  and Safeguards
NAME      CPetrone*      PKleene*          PLain              EWeiss            PLee        LRoche


Office of Nuclear Reactor RegulationOffice of Nuclear Material Safety  and SafeguardsTechnical Contacts:Paul LainPeter LeeNRR/DSSA/SPLBNMSS/FCSS/FCLB
DATE      06/07/2001    06/13/2001          6/25/2001            6/28/2001      6/272001      6/272001 NMSS            REXB          C:REXB


(301) 415-2346(301) 415-8111 E-Mail: pwl@nrc.govE-mail: psl1@nrc.govAttachments:1.List of Recently Issued NRC Information Notices
===MLeach          JTappert      LMarsh===
  6/28/2001        6/282001      6/28/2001


2.List of Recently Issued NMSS Information NoticesDistribution:IN Reading FilePUBLICADAMS ACCESSION NUMBER:ML011790352OFFICEREXB:Tech EditorDSSA:NMSSNMSSNMSSNAMECPetrone*PKleene*PLainEWeissPLeeLRocheDATE06/07/200106/13/2001    6/25/2001    6/28/2001    6/272001    6/272001NMSSREXBC:REXBMLeachJTappertLMarsh    6/28/2001    6/282001    6/28/2001OFFICIAL RECORD COPY
Attachment 1 LIST OF RECENTLY ISSUED


______________________________________________________________________________________OL = Operating License
NRC INFORMATION NOTICES


CP = Construction PermitAttachment 1 LIST OF RECENTLY ISSUEDNRC INFORMATION NOTICES_____________________________________________________________________________________InformationDate of
_____________________________________________________________________________________
Information                                        Date of


Notice No.         SubjectIssuanceIssued to______________________________________________________________________________________2001-09Main Feedwater SystemDegradation in Safety-Related
Notice No.             Subject                    Issuance  Issued to


===ASME Code Class 2 Piping===
______________________________________________________________________________________
Inside the Containment of a
2001-09          Main Feedwater System            06/12/01    All holders of operating licenses


Pressurized Water Reactor06/12/01All holders of operating licensesfor pressurized water nuclear
Degradation in Safety-Related                for pressurized water nuclear


power reactors, except those who
ASME Code Class 2 Piping                    power reactors, except those who


have permanently ceased
Inside the Containment of a                  have permanently ceased


operations and have certified that
Pressurized Water Reactor                    operations and have certified that


fuel has been permanently
fuel has been permanently


removed from the reactor vessel2001-08Supplement 1Update on the Investigation ofPatient Deaths in Panama,
removed from the reactor vessel
 
2001-08          Update on the Investigation of  06/06/01    All Medical Licensees
 
Supplement 1      Patient Deaths in Panama, Following Radiation Therapy
 
Overexposures
 
2001-08          Treatment Planning System        06/01/01    All medical licensees
 
Errors Result in Deaths of
 
Overseas Radiation Therapy


===Following Radiation Therapy===
Patients
Overexposures06/06/01All Medical Licensees2001-08Treatment Planning SystemErrors Result in Deaths of


===Overseas Radiation Therapy===
2001-07          Unescorted Access Granted        05/11/01    All holders of nuclear reactor
Patients06/01/01All medical licensees2001-07Unescorted Access GrantedBased on Incomplete and/or


Inaccurate Information05/11/01All holders of nuclear reactoroperating licenses who are
Based on Incomplete and/or                  operating licenses who are


subject to Section 73.56 of Title
Inaccurate Information                      subject to Section 73.56 of Title


10, of the Code of Federal
10, of the Code of Federal


Regulations (10 CFR 73.56),
Regulations (10 CFR 73.56),
"Personnel Access Authorization
                                                              Personnel Access Authorization
 
Requirements of Nuclear Power


===Requirements of Nuclear Power===
Plants.
Plants."2001-06Centrifugal Charging PumpThrust Bearing Damage not


===Detected Due to Inadequate===
2001-06          Centrifugal Charging Pump        05/11/01    All holders of operating licenses
Assessment of Oil Analysis


===Results and Selection of Pump===
Thrust Bearing Damage not                    for nuclear power reactors, Detected Due to Inadequate                  except those who have
Surveillance Points05/11/01All holders of operating licensesfor nuclear power reactors, except those who have


permanently ceased operations
Assessment of Oil Analysis                  permanently ceased operations


and have certified that fuel has
Results and Selection of Pump                and have certified that fuel has


been permanently removed from
Surveillance Points                          been permanently removed from


the reactor vessel2001-05Through-Wall CircumferentialCracking of Reactor Pressure
the reactor vessel


===Vessel Head Control Rod Drive===
2001-05          Through-Wall Circumferential    04/30/01    All holders of operating licenses
Mechanism Penetration


===Nozzles at Oconee Nuclear===
Cracking of Reactor Pressure                for pressurized water nuclear
Station, Unit 304/30/01All holders of operating licensesfor pressurized water nuclear


power reactors except those who
Vessel Head Control Rod Drive                power reactors except those who


have ceased operations and have
Mechanism Penetration                        have ceased operations and have


certified that fuel has been
Nozzles at Oconee Nuclear                    certified that fuel has been


permanently removed from the
Station, Unit 3                              permanently removed from the


reactor vessel
reactor vessel


Attachment 2 LIST OF RECENTLY ISSUEDNMSS INFORMATION NOTICES_____________________________________________________________________________________InformationDate of
______________________________________________________________________________________
OL = Operating License
 
CP = Construction Permit


===Notice No.        SubjectIssuanceIssued to===
Attachment 2 LIST OF RECENTLY ISSUED
_____________________________________________________________________________________2001-08, Supplement 1Update on the Investigation ofPatient Deaths in Panama,


===Following Radiation Therapy===
NMSS INFORMATION NOTICES
Overexposures06/06/01All medical licensees.2001-08Treatment Planning SystemErrors Result in Deaths of


===Overseas Radiation Therapy===
_____________________________________________________________________________________
Patients06/01/01All medical licensees.2001-03Incident ReportingRequirements for Radiography
Information                                      Date of


Licensees04/06/01All industrial radiographylicensees.2001-01The Importance of AccurateInventory Controls to Prevent
Notice No.          Subject                      Issuance  Issued to
 
_____________________________________________________________________________________
2001-08,      Update on the Investigation of  06/06/01    All medical licensees.
 
Supplement 1  Patient Deaths in Panama, Following Radiation Therapy
 
Overexposures
 
2001-08        Treatment Planning System        06/01/01    All medical licensees.
 
Errors Result in Deaths of
 
Overseas Radiation Therapy
 
Patients
 
2001-03        Incident Reporting              04/06/01    All industrial radiography
 
Requirements for Radiography                licensees.
 
Licensees
 
2001-01        The Importance of Accurate      03/26/01    All material licensees.
 
Inventory Controls to Prevent


the Unauthorized Possession
the Unauthorized Possession


of Radioactive Material03/26/01All material licensees.2000-22Medical MisadministrationsCaused by Human Errors
of Radioactive Material
 
2000-22        Medical Misadministrations      12/18/00    All medical use licensees
 
Caused by Human Errors                       authorized to conduct gamma
 
Involving Gamma Stereotactic                stereotactic radiosurgery
 
Radiosurgery (GAMMA KNIFE)                  treatments.


===Involving Gamma Stereotactic===
2000-19        Implementation of Human Use      12/05/2000  All medical use licensees.
Radiosurgery (GAMMA KNIFE)12/18/00All medical use licenseesauthorized to conduct gamma


stereotactic radiosurgery
Research Protocols Involving


treatments.2000-19Implementation of Human UseResearch Protocols Involving
U.S. Nuclear Regulatory


===U.S. Nuclear Regulatory===
Commission Regulated
Commission Regulated


Materials12/05/2000All medical use licensees.2000-18Substandard Material Suppliedby Chicago Bullet Proof
Materials
 
2000-18        Substandard Material Supplied    11/29/2000  All 10 CFR Part 50 licensees and
 
by Chicago Bullet Proof                     applicants.
 
Systems                                      All category 1 fuel facilities.
 
All 10 CFR Part 72 licensees and


Systems11/29/2000All 10 CFR Part 50 licensees andapplicants.
applicants.


All category 1 fuel facilities.
2000-16        Potential Hazards Due to        10/5/2000  All licensees that process


===All 10 CFR Part 72 licensees and===
Volatilization of Radionuclides              unsealed byproduct material.
applicants.2000-16Potential Hazards Due toVolatilization of Radionuclides10/5/2000All licensees that processunsealed byproduct material.2000-15Recent Events Resulting inWhole Body Exposures


Exceeding Regulatory Limits9/29/2000All radiography licensees.
2000-15        Recent Events Resulting in      9/29/2000  All radiography licensees.


}}
Whole Body Exposures
 
Exceeding Regulatory Limits}}


{{Information notice-Nav}}
{{Information notice-Nav}}

Latest revision as of 05:48, 24 November 2019

Failure of Central Sprinkler Company'S Model Gb Series Fire Sprinkler Heads
ML011790352
Person / Time
Issue date: 06/28/2001
From: Leach M, Marsh L
NRC/NMSS/FCSS/FCLB, Division of Regulatory Improvement Programs
To:
References
IN-01-010
Download: ML011790352 (7)
v • d • e


UNITED STATES

NUCLEAR REGULATORY COMMISSION

OFFICE OF NUCLEAR REACTOR REGULATION

Washington, D.C. 20555-0001 June 28, 2001 NRC INFORMATION NOTICE 2001-10: FAILURE OF CENTRAL SPRINKLER COMPANY

MODEL GB SERIES FIRE SPRINKLER HEADS

Addressees

All holders of licenses for nuclear power, research, and test reactors and fuel cycle facilities.

Purpose

The U.S. Nuclear Regulatory Commission (NRC) is issuing this information notice to warn

addressees that certain Model GB series sprinkler heads manufactured by Central Sprinkler

Co. of Lansdale, Pennsylvania, have a potential for failure. It is expected that recipients will

review the information for applicability and consider actions, as appropriate, to ensure safety at

their facilities. However, suggestions contained in this information notice are not NRC

requirements; therefore, no specific action or written response is required.

Description of Circumstances

On April 24, 2001, Underwriters Laboratories Inc. (UL) issued a news release on the failures

of field samples of certain Model GB series sprinkler heads during operational testing. UL

tested over 1800 GB series heads from over 100 different locations and found that 26 percent

of the sprinkler heads needed higher water pressure than the 5 psi required for UL listing.

Seven percent needed over 40 psi to operate and some did not operate at 60 psi. This is of

great concern because the sprinkler systems are relied upon to protect structures, systems, or

components important to safety against fire.

The sprinkler heads have O-ring water seals and were introduced in 1988. The following

models are of concern: GB, GB-ALPHA, GB-J, GB-QR, GB-EC, GB-RS, GB-20, GB-20QR,

GBR, GB-R1, GB-R2, GBR-LF, GB4, GB4-EC, GB4-FR, GB4-QREC, BB1, BB2, BB3, SD1, SD2, SD3, HIP, ROC, LF, and WS. Because of design changes, some of these models may

have O-ring water seals and some may have disc spring water seals. Only the sprinkler head

models with the O ring seal are of concern, not the models with the disc spring water seals.

ULs Web site at: www.ul.com/about/newsrel/nr042401.html has pictures and descriptions of

the water seals of different models.

Licensees who have GB series sprinkler heads installed in their facility may consider having

some of the heads tested. UL will test heads submitted at no additional cost beyond the

expense of removal, packaging, handling, and postage. Instructions for selecting, removing, and packaging the heads can be obtained from Central Sprinkling Co. at 1-800-523-6512.

Related Generic Communications

! IN 99-28, Recall of Star Brand Fire Protection Sprinkler Heads, September 30, 1999

! IN 97-72, Potential for Failure of the Omega Series Sprinkler Heads, September 22,

1997 This information notice requires no specific action or written response. If you have any

questions about the information in this notice, please contact one of the technical contacts

listed below or the appropriate Office of Nuclear Reactor Regulation (NRR) or Office of Nuclear

Material and Safeguards (NMSS) project manager.

/RA/J. Tappert for /RA/L. Roche for

Ledyard B. Marsh, Chief Melvyn N. Leach, Acting Chief

Events Assessment, Generic Communications Fuel Cycle Licensing Branch

and Non-Power Reactors Branch Division of Fuel Cycle Safety

Division of Regulatory Improvement Programs and Safeguards

Office of Nuclear Reactor Regulation Office of Nuclear Material Safety

and Safeguards

Technical Contacts: Paul Lain Peter Lee

NRR/DSSA/SPLB NMSS/FCSS/FCLB

(301) 415-2346 (301) 415-8111 E-Mail: pwl@nrc.gov E-mail: psl1@nrc.gov

Attachments:

1. List of Recently Issued NRC Information Notices

2. List of Recently Issued NMSS Information Notices

ML011790352 OFFICE REXB: Tech Editor DSSA: NMSS NMSS NMSS

NAME CPetrone* PKleene* PLain EWeiss PLee LRoche

DATE 06/07/2001 06/13/2001 6/25/2001 6/28/2001 6/272001 6/272001 NMSS REXB C:REXB

MLeach JTappert LMarsh

6/28/2001 6/282001 6/28/2001

Attachment 1 LIST OF RECENTLY ISSUED

NRC INFORMATION NOTICES

_____________________________________________________________________________________

Information Date of

Notice No. Subject Issuance Issued to

______________________________________________________________________________________

2001-09 Main Feedwater System 06/12/01 All holders of operating licenses

Degradation in Safety-Related for pressurized water nuclear

ASME Code Class 2 Piping power reactors, except those who

Inside the Containment of a have permanently ceased

Pressurized Water Reactor operations and have certified that

fuel has been permanently

removed from the reactor vessel

2001-08 Update on the Investigation of 06/06/01 All Medical Licensees

Supplement 1 Patient Deaths in Panama, Following Radiation Therapy

Overexposures

2001-08 Treatment Planning System 06/01/01 All medical licensees

Errors Result in Deaths of

Overseas Radiation Therapy

Patients

2001-07 Unescorted Access Granted 05/11/01 All holders of nuclear reactor

Based on Incomplete and/or operating licenses who are

Inaccurate Information subject to Section 73.56 of Title

10, of the Code of Federal

Regulations (10 CFR 73.56),

Personnel Access Authorization

Requirements of Nuclear Power

Plants.

2001-06 Centrifugal Charging Pump 05/11/01 All holders of operating licenses

Thrust Bearing Damage not for nuclear power reactors, Detected Due to Inadequate except those who have

Assessment of Oil Analysis permanently ceased operations

Results and Selection of Pump and have certified that fuel has

Surveillance Points been permanently removed from

the reactor vessel

2001-05 Through-Wall Circumferential 04/30/01 All holders of operating licenses

Cracking of Reactor Pressure for pressurized water nuclear

Vessel Head Control Rod Drive power reactors except those who

Mechanism Penetration have ceased operations and have

Nozzles at Oconee Nuclear certified that fuel has been

Station, Unit 3 permanently removed from the

reactor vessel

______________________________________________________________________________________

OL = Operating License

CP = Construction Permit

Attachment 2 LIST OF RECENTLY ISSUED

NMSS INFORMATION NOTICES

_____________________________________________________________________________________

Information Date of

Notice No. Subject Issuance Issued to

_____________________________________________________________________________________

2001-08, Update on the Investigation of 06/06/01 All medical licensees.

Supplement 1 Patient Deaths in Panama, Following Radiation Therapy

Overexposures

2001-08 Treatment Planning System 06/01/01 All medical licensees.

Errors Result in Deaths of

Overseas Radiation Therapy

Patients

2001-03 Incident Reporting 04/06/01 All industrial radiography

Requirements for Radiography licensees.

Licensees

2001-01 The Importance of Accurate 03/26/01 All material licensees.

Inventory Controls to Prevent

the Unauthorized Possession

of Radioactive Material

2000-22 Medical Misadministrations 12/18/00 All medical use licensees

Caused by Human Errors authorized to conduct gamma

Involving Gamma Stereotactic stereotactic radiosurgery

Radiosurgery (GAMMA KNIFE) treatments.

2000-19 Implementation of Human Use 12/05/2000 All medical use licensees.

Research Protocols Involving

U.S. Nuclear Regulatory

Commission Regulated

Materials

2000-18 Substandard Material Supplied 11/29/2000 All 10 CFR Part 50 licensees and

by Chicago Bullet Proof applicants.

Systems All category 1 fuel facilities.

All 10 CFR Part 72 licensees and

applicants.

2000-16 Potential Hazards Due to 10/5/2000 All licensees that process

Volatilization of Radionuclides unsealed byproduct material.

2000-15 Recent Events Resulting in 9/29/2000 All radiography licensees.

Whole Body Exposures

Exceeding Regulatory Limits


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